Syringe



(No Model.)

W.YH. KNAP.l

SYRINGE.

Patented Dec. 24, 1895.

- UNrTED Samarasy PATENT FFICE.

WILLIAM H. KNAP, OF CHICAGO, ILLINOIS. y

SYRINGE.

'SPECIFICATION forming part of Letters Patent No. 551,973, datedDecember 24, 1895.

application ma october 2, 189s.

Serial No. 486,942. (No model.)

To a/ZZ whowt t may concern:

Be it known that I, VILLIAM H. KNAP, a citizen of the United States ofAmerica, residing at Chicago, in the county of Cook and State ofIllinois, have invented certain new and useful Improvements inVaginalSyringes, of which the following is a specification.

My invention relates to improvements in vaginal syringes, its objectbeing to provide a syringe simple in construction, convenient inoperation, capable of being readily cleaned, and adapted to be used forevery purpose ofv such an instrument, and particularly in the injectionof hot liquids.

The invention is fully described and eX- plained in this specificationand shown in the accompanying drawings, in which- Figure l is a sideelevation of a syringe embodying my invention, and Fig. 2 is a centrallongitudinal section thereof.

In the views, A A' A2 are the walls of the hollow conoidal body of thesyringe, the outer wall A being a frustum of a cone flaring outward atits larger base, the inner wallA' being a cylindrical tube of the samediameter as is the smaller end of the frustum, and the wall A2 being aplane annular plate joining the corresponding ends of the walls A A'.The three walls A A' A2 include a closed airspace interposed between thewalls A` A2 and insulating the outer wall against heat applied to theinner. p

About the opening in the base A2 is a projecting cylindrical tube A3,forming practically an extension of the inner wall A'. This tube isexternally screw-threaded and receives an internally-threaded cylinderB, having a terminal cap B', in which is set a longitudinally-adjustabletube C coincident with the axis of the syringe. One end C' of the tubeprojects beyond the smaller end of the body, and is rounded andperforated for the discharge of liquids. The other end C2 projects fromthe cap B', and is so shaped as to readily receive the end of a rubbertube D, connected with a reservoir R or other source of supply ofliquids. A discharge-tube C3 is set in the cylindrical wall B, and formsan outlet from the space about the tube C. The outer end of thedischarge-tube is shaped like that of vbody being adapted to permit itsinsertion a sufficient distance for the effective use of the instrument.Liquid passing along the rubber tube D from the source of supply entersthrough the tube C and is discharged through its perforated end C', andthus reaches the surfaces to be treated. As fast as the liquid entersthrough the tube C, it escapes throughl the space about it and passesthrough the discharge-tube C3 and rubber tube D'. In the insertion ofthe syringe and during its use the projecting cylinder B serves as ahandle by whichl the syringe may be securely held, and it also forms apart of the channel by which the liquid reaches the discharge-tube C3.Furthermore the placing of the dischargetube in the side wall of thisprojection renders it possible to bring the discharge-tube into adownwardly-pointing vertical position when the syringe is in use, andthereby facilitates the perfect drainage of the syringe.

It is frequently desirable to use a syringe of this class for theinjection of liquids heated to a high temperature, and it is extremelydesirable in such uses to prevent as far as possible the heating of theouter surface of the body of the syringe, since the surfaces intended tobe reached by the heated liquid are much less sensitive to heat thanthose in contact With the body of the syringe. It is for this reasonthat the body is made hollow, as shown in the drawings, and is alsopreferably formed of hard rubber or other similar material which is apoor conductor of heat. Actual experience shows that a syringe formed asshown in the drawings and made of hard rubber may be used for anynecessary length of time in the injection of liquids at the highestdesirable temperature without becoming inconveniently hot.

It will be observed that the parts of the syringe may be readilyseparated for the purpose of cleaning them, and I consider it suffi! IOOon the neck, A3, sind having tbe lateral dise charge-tube, C3, and* theinduction tube, C, extending through the cap, B, B', and the spaceWithin thebody, said induction tube being longitudinally adjustableWithin the body and being formed With discharge openings at one end,andadapted to receive a supply tube at the opposite end, substantially esshown and described.v i

WILLIAM Il. KNAI".`

Witnesses CHARLES O. SHERVEY, N. ARoenns.

